Chevrolet Silverado 2004–2005 — technical service bulletin
Bulletin 3328B · NHTSA communication 10017202 · issued Oct 28, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2005
model years
4
vehicle entries
Official summary
Engine rpm surge at 1100 to 1400 rpm. This condition may be noticed more when towing. *tt
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.